I think another good example is psychopaths. There are plenty floating around, but it's sort of the prime feature of their behavior - they really only care abo

I think another good example is psychopaths. There are plenty floating around, but it's sort of the prime feature of their behavior - they really only care about themselves. So, why would they write a book to give society a glimpse? Their motives simply don't align with that goal, because it's the literal definition of their behavior.